Lipitor is a medication used to treat high cholesterol, and it is important to follow your doctor's instructions when taking it. According to [1], Lipitor's patent has expired, and there are generic versions available. However, it is not recommended to stop taking statins like Lipitor abruptly, as it can have negative effects on your health. According to [2], there are eight reasons why you should not stop taking your cholesterol-lowering medication, including the risk of heart attack, stroke, and other cardiovascular events. It is important to talk to your doctor before making any changes to your medication regimen. According to [3], if you and your doctor decide to stop taking statins, it should be done gradually, under medical supervision. This can help to minimize the risk of negative side effects and allow your body to adjust to the change. In conclusion, while Lipitor's patent has expired and there are generic versions available, it is important to talk to your doctor before making any changes to your medication regimen, and stopping statins like Lipitor abruptly is not recommended.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/classes/statins/stopping-statins-eight-reasons-you-should-not-stop-your-cholesterol-drug
[3] https://www.healthline.com/health/high-cholesterol/how-to-safely-come-off-statins